Video display apparatus

Abstract

The video display apparatus of the present invention detects a vertical picture size steadily and displays a picture from a video signal accompanied by a closed caption, so that the closed caption does not fall out of the display screen. A closed caption decoder extracts a start line code which determines a position from which a horizontal scan starts along a vertical axis of an active picture area of the video signal and an end line code which determines a position at which the horizontal scan terminates. Based on the start line code and the end line code, a vertical picture size is calculated, and position in which the closed caption information is to be displayed is controlled, according to the vertical picture size.

What is claimed is:  
     
         1 . A video display apparatus comprising: 
 closed caption decoder, which extracts a closed caption signal embedded in a video signal and derives closed caption information therefrom;    calculator which calculates a vertical picture size corresponding to an active picture area after extracting from the video signal a start line code which determines a position from which a horizontal scan starts along a vertical axis of the active picture area of the video signal and an end line code which determines a position at which the horizontal scan terminates, wherein the start line code and the end line code are included in a data signal embedded in the video signal; and    position controller which controls position in which said closed caption information is to be displayed on a display screen, according to the vertical picture size.    
     
     
         2 . A video display apparatus according to  claim 1 , wherein: 
 said video signal is an analog video signal;    said closed caption decoder is configured to extract the closed caption signal added to the video signal in a vertical blanking interval; and    said calculator is configured to extract from an aspect ratio information signal added to the video signal in the vertical blanking interval the start line code which determines the position from which the horizontal scan starts along the vertical axis of the active picture area of the video signal and the end line code which determines the position at which the horizontal scan terminates.    
     
     
         3 . A video display apparatus according to  claim 1 , wherein said display screen has an aspect ratio of 16:9.  
     
     
         4 . A video display apparatus comprising: 
 closed caption decoder, which extracts a closed caption signal embedded in a video signal and derives closed caption information therefrom;    extractor which extracts from the video signal a start line code which determines a position from which a horizontal scan starts along a vertical axis of an active picture area of the video signal and an end line code which determines a position at which the horizontal scan terminates, wherein the start line code and the end line code are included in a data signal embedded in the video signal;    a calculator which calculates a vertical picture size corresponding to the active picture area from the start line code and the end line code, setting a zoom ratio from the vertical picture size, and zooming a picture from the video signal in the active picture area at the zoom ratio; and    position controller which controls position in which said closed caption information is to be displayed at the zoom ratio on a display screen, according to the positional data for displaying the closed caption and the zoom ratio.    
     
     
         5 . A video display apparatus according to  claim 4 , wherein: 
 said video signal is an analog video signal;    said closed caption decoder is configured to extract the closed caption signal added to the video signal in a vertical blanking interval; and    said calculator is configured to extract from an aspect ratio information signal added to the video signal in the vertical blanking interval the start line code which determines the position from which the horizontal scan starts along the vertical axis of the active picture area of the video signal and the end line code which determines the position at which the horizontal scan terminates.    
     
     
         6 . A video display apparatus according to  claim 4 , wherein said display screen has an aspect ratio of 16:9.  
     
     
         7 . A video display apparatus having a wide display screen with a wider aspect ratio, comprising: 
 a closed caption decoder which extracts and decodes a closed caption signal added to a video signal in a vertical blanking interval and derives closed caption information from the caption signal, and extracts and decodes an aspect ratio information signal which is an extended data service signal added to the video signal in the vertical blanking interval and derives aspect ratio information from the aspect ratio information signal;    zooming and displaying controller which zooms and displays a picture from the video signal and said closed caption information on the display screen; and    calculator and position controller which performs the following: 
 calculating a vertical picture size corresponding to an active picture area from a start line code which determines a position from which a horizontal scan starts along a vertical axis of the active picture area of the video signal and an end line code which determines a position at which the horizontal scan along the vertical axis of the active picture area terminates, the start line code and the end line code being included in said aspect ratio information and received from said closed caption decoder;  
 calculating a zoom ratio of zooming the picture from the video signal in the active picture area on the display screen, based on the vertical picture size and controlling zooming by said zooming means; and  
 controlling position in which said closed caption information is to be displayed at the zoom ratio on the display screen, according to positional data for displaying the closed caption, the positional data being included in said closed caption information and received from said closed caption decoder,  
 wherein the video display apparatus displays the picture from the video signal accompanied by said closed caption information at the zoom ratio in the active picture area, so that the closed caption does not fall out of the display screen.  
   
     
     
         8 . A video display apparatus according to  claim 7 , wherein said display apparatus is a projection type and has the display screen with an aspect ratio of 16:9.